Analysis of photoluminescence spectra of lead-tungstate single crystals

In addition to the intrinsic blue emission band near 430 nm for an ideal PbWO₄ scheelite structure, the presence of three extra emission bands peaking near blue-green and green-red colors was clearly identified for thermally synthesized bulk crystals with the help of a reliable fitting process applicable for microscopic analysis of recorded PL spectra. The origin, nature, and electro-optical behaviors of the extra emission bands are strongly related to the structural change from an ideal scheelite to modified ones, so now we can more clcsely track down the nature and the relevant behaviors, which are still in dispute, of the apparent colors of the PbWO₄ scintillating medium by constructing structural models and by considering the energy transfer mechanism between the color centers.